rachel smith is back with all the details. rachel. >> it was a surprise announcement last night. but it has all the kardashians cheering. a little one on the way for kim and kanye. seems like the couple couldn't be happier. take a look. it was news so big that kanye west just had to share it with the world. >> can me make some noise for my baby mama right here. >> reporter: and with that, the crowd of 5,000 in atlantic city roared its delight. social media went ablaze. her sister, kourtney, tweeting, another angel to welcome to our family. overwhelmed with excitement. khloe chimed in. keeping secrets is hard with so many family member. expeshlly when you are so freaking excited. love is everything. and kim's mom kris added, i'm happy girl, wowza. the 35-year-old rapper and 32-year-old reality star went public with their relationship in march. three months later, kim td oprah why they clicked. >> i love that i'm with someone a couple of years orlando than me. before, all my boyfriends were younger. i dated five years mounger. my whole thing was different. >> reporter: she's still